[WIP] Created cli tool JSONTestSuiteCLI

Package.swift

@@ -14,9 +14,18 @@ var package = Package(
       targets: ["PureSwiftJSONParsing"]),
   ],
   dependencies: [
-
+    // these are only used for testing
+    .package(url: "https://github.com/apple/swift-argument-parser.git", .upToNextMajor(from: "0.0.1")),
+    .package(url: "https://github.com/apple/swift-nio", .upToNextMajor(from: "2.13.0"))
   ],
   targets: [
+    .target(
+      name: "JSONTestSuiteCLI",
+      dependencies: [
+        .product(name: "ArgumentParser", package: "swift-argument-parser"),
+        .product(name: "NIO", package: "swift-nio"),
+      ]
+    ),
     .target(
       name: "PureSwiftJSONCoding",
       dependencies: ["PureSwiftJSONParsing"]),

Sources/JSONTestSuiteCLI/main.swift

@@ -0,0 +1,39 @@
+import ArgumentParser
+import NIO
+
+struct JSONTestSuiteCLI: ParsableCommand {
+
+  @Argument(help: "the json file to parse") var jsonFile: String
+
+  func run() throws {
+    // here lives the logic
+
+    let bytes = try self.read(file: jsonFile)
+
+
+  }
+
+  func read(file: String) throws -> [UInt8] {
+
+    let group = MultiThreadedEventLoopGroup(numberOfThreads: 1)
+    defer {
+        try! group.syncShutdownGracefully()
+    }
+    let loop = group.next()
+    let threadPool = NIOThreadPool(numberOfThreads: 1)
+    threadPool.start()
+    defer {
+        try! threadPool.syncShutdownGracefully()
+    }
+    let fileIO = NonBlockingFileIO(threadPool: threadPool)
+
+    let (handle, region) = try fileIO.openFile(path: file, eventLoop: loop).wait()
+    let allocator = ByteBufferAllocator()
+    var buffer = try fileIO.read(fileRegion: region, allocator: allocator, eventLoop: loop).wait()
+
+    return buffer.readBytes(length: buffer.readableBytes)!
+  }
+
+}
+
+JSONTestSuiteCLI.main()